Fig. 2

a Sri Lanka, showing the geographical origin of samples of Pethia cumingii and P. reval used in this study. The thin black lines indicate basin boundaries, while the bold black line indicates the 2000-mm isohyet, which encompasses the wet zone. Numbers on the map represent the sampling localities listed in Table 1. Pethia reval in b live coloration and c in preservation, DZ5354A, 30.9Â mm SL, Attanagalu basin. Population of P. cf. cumingii from Kalu basin with orange fins in (d) live coloration and e in preservation, DZ3917A, 30.8Â mm SL. Pethia cumingii from southerly basins (here Gin) in (f) live coloration and g in preservation, DZ5014A, 27.8Â mm SL